Oil boilers, would you expect the engineer to mark up price?

I am having a new oil boiler installed as the old one died. Now got a guy installing it, who has been great with the old one and has patched it up and made it last when he could have just said "you need a new one"

Now the time has come for a new one and it was delivered when he was out so i have the paperwork and it seems he is significantly marking up the cost of the boiler or his labour rate is sky high (which it hasn't been before)

Basically he is charging £1400 to fit boiler over a couple of days, now there may well be mark up in there on the boiler. Is this normal? Obviously I want a good job so haven't said anything yet. So do I wait for the invoice and then challenge him once the job is complete?

In my experience plumbers charge double normal day rate to install any boiler.

Just seems to be how they work.

Ultimately if have agreed to a price, and not an hourly/day rate then you shouldn't quibble the price once the works done. How would you like it if you boss at the end of the week decided now was time to renegotiate your pay for the work you have already done!

Quite normal for him to charge retail when he's bought at trade IMO. It would maybe have been a good idea to check boiler prices for a rough order of cost when you got the estimate, or to have asked for a parts/labour split. Have a friendly chat, £700 a day for labour seems steep, even if you do include a bit of markup on the materials.